feat(css_formatter): support @page and margin at-rules #1331
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Summary
New at-rules added in #1319! In a follow-up PR, I think I'm going to start abstracting out some of the list formatting since there are a lot of nodes that use similar structures (either a separated list that gets printed compactly, or a non-separated list that preserves empty lines).
Test Plan
Added two spec tests to cover cases similar to the parser spec tests. The snapshots appear formatted correctly.